Possible SPAM (accuracy low): [olug] Unix Tip: I SED BLANK

[Trent Melcher]

The tips are back....COOL.  Anyone know what happened? Why we weren't
getting them for a couple weeks?


Trent


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 |Trent Melcher                     |
 |Network/System Administrator      |
 |Startouch International LTD.      |
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 -----Original Message-----
From: olug-admin at olug.org [mailto:olug-admin at olug.org]On Behalf Of Unix
Guru Universe
Sent: Tuesday, February 18, 2003 1:22 PM
To: olug at olug.org
Subject: Possible SPAM (accuracy low): [olug] Unix Tip: I SED BLANK



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			      UNIX GURU UNIVERSE
			         UNIX HOT TIP

			Unix Tip 1875 - February 18, 2003

		    http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=


I SED BLANK

Using sed, you can remove blank lines, and
lines that contain only whitespace, from a
file using the following:

sed -e '/^[     ]*$/d' InputFile >OutputFile

Within the single quotes ('), the forward
slashes (/) delimit the regular expression
that will be interpreted by sed.  The "d"
before the closing single quote, tells sed
to delete any lines that match the regular
expression.

Within the regular expression, the caret
(^) matches the beginning of a line.
The []* matches zero to many occurrences of
the character list between the open bracket
([) and the close bracket (]) (in the above
regular expression, you must insert a space
and a tab between the brackets).  The dollar
sign ($) matches the end of a line.

These three constructs together match any
blank line or any line that contains only
spaces and tabs (in any combination).

Since the standard operation of sed is to
echo lines to stdout, all lines except blank
lines (or lines that only contain whitespace)
will be sent to OutputFile.


This tip generously supported by: tim.couger at wcom.com



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